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Mingling in the magmatic system of ischia (Italy) in the past 5 ka

„Mingling” im magmatischen System von Ischia (Italien) während der letzten 5.000 Jahre

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Summary

In the past 5 ka volcanism has been very intense at Ischia, a densely populated and still active volcanic island in the Gulf of Napoli. Mineralogical, geochemical and isotopic investigations have been carried out on the pyroclastic deposits and lava flows of the historical eruptions of Fiaiano (530–960 A. D.) and Arso (1302 A. D.). These products are characterized by strong petro-chemical disequilibria. Mineralogical disequilibria are shown by the occurrence of resorbed and reversely zoned phenocrysts, and by the coexistence of phenocrysts and microlites with variable composition. Chemical inhomogeneity characterizes the glass of the juvenile fragments. Isotopic disequilibria have been detected among all separated mineral phases and whole-host rock. The detected disequilibria are interpreted as the result of a physical mixing process between variable fractionated and isotopically distinct batches of magmas.

Petrochemical data suggest that mingling occurred between a highly crystallized alkali-trachytic and an isotopically distinct latitic to trachytic magmas, for both the eruptions. The pre-eruptive scenario proposed is the uprising of a latitic-to-trachytic magma (characterized by a Sr-isotope ratio of about 0.7068) from a deep reservoir and successive mingling with batches of more viscous, highly crystallized alkali-trachytic magma (with a Sr-isotope composition of about 0.7061) at shallow depth.

Zusammenfassung

Während der letzten 5.000 Jahre (5 ka) gab es intensiven Vulkanismus auf Ischia, einer dicht bevölkerten and noch jetzt vulkanisch aktiven Insel im Golf von Neapel. Mineralogische, geochemische und Isotopen-Untersuchungen wurden an pyroklastischen Lagen und Lavaergüssen der historischen Eruptionen von Viaino (530–960 n.Chr.) und Arso (1302 n.Chr.) durchgeführt. Diese vulkanischen Produkte sind durch starke petro-chemische Ungleichgewichte charakterisiert. Mineralogische Ungleichgewichte sind in Vorkommen von resorbierten und invers zonierten Phänokristallen und in der Koexistenz von Phänokristallen und Mikroliten verschiedener Zusammensetzung zu erkennen. Chemische Inhomogenität charakterisiert das Glas der juvenilen Fragmente. Isotopisches Ungleichgewicht konnte in allen abgetrennten Mineralphasen und in Gesamtgesteinsproben nachgewiesen werden. Diese Ungleichgewichte werden als das Ergebnis eines physikalischen Mischprozesses zwischen verschieden fraktionierten und isotopisch charakterisierten Magmaschüben interpretiert.

Petrochemische Daten zeigen, dass Mingling zwischen einem stark kristallisierten Alkali-trachytischen und einem isotopisch anders zusammengesetzten latitischen bis trachytischen Magma in beiden Eruptionen stattgefunden hat. Als Szenario vor der Eruption ist der Aufstieg eines latitischen bis trachytischen Magmas (charakterisiert durch ein Sr-Isotopenverhältnis von ungefähr 0,7068) aus einem tiefen Reservoir und darauf folgendes „Mingling” mit Schüben von mehr viskosem, stark kristallisiertem Alkali-trachytischem Magma (mit einer Strontium Isotopen Zusammensetzung von 0,7061) in geringer Tiefe zu sehen.

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Authors and Affiliations

  1. Osservatorio Vesuviano, Ercolano, I-80056, Ercolano, Napoli, Italy

    M. Piochil, L. Civetta & G. Orsil

  2. Dipartimento di Geofisica e Vulcanologia, Università di Napoli “Federico II”, Napoli, Italy

    L. Civetta

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  1. M. Piochil
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  2. L. Civetta
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  3. G. Orsil
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Piochil, M., Civetta, L. & Orsil, G. Mingling in the magmatic system of ischia (Italy) in the past 5 ka. Mineralogy and Petrology 66, 227–258 (1999). https://doi.org/10.1007/BF01164495

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